This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics magazine. The source must be symmetrical. The capacitors can be changed for other frequencies.
May 2017 - The new 36V TLVx171 Series of General Purpose Operational Amplifiers from Texas...
This circuit was found in an American 1980s documentation. The transistorized step is the...
Using the 4001 integrated circuit, this latching relay can employ any general-purpose transistor. The...